Velocity dispersion profiles of dwarf spheroidal galaxies with self-interacting ultralight dark matter
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866910035086409728 |
|---|---|
| author | Korshynska, K. Gorbar, E. V. Bidasyuk, Y. M. Yakimenko, A. I. Revaz, Y. |
| author_facet | Korshynska, K. Gorbar, E. V. Bidasyuk, Y. M. Yakimenko, A. I. Revaz, Y. |
| contents | Dark-matter-dominated dwarf galaxies provide an excellent laboratory for testing dark matter models at small scale and, in particular, the ultralight dark matter (ULDM) class of models. Within the framework of self-interacting bosonic dark matter, we use the observed velocity-dispersion profiles of seven dwarf spheroidal galaxies to constrain the parameters of ULDM. In our modeling, we account for the impact of the baryonic component on the velocity dispersion and ULDM halo structure. We find that the repulsive self-interaction of ULDM, which fits the observations, is almost negligible, consistent with non-interacting ULDM with a boson mass of approximately $1.6 \times 10^{-22}\,\mathrm{eV}$. In contrast, for attractively interacting ULDM, the best fit corresponds to a smaller boson mass of about $1.3 \times 10^{-22}\,\mathrm{eV}$, with self-interaction playing a significant role in shaping the dark-matter halo and thereby influencing the interpretation of observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_15815 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Velocity dispersion profiles of dwarf spheroidal galaxies with self-interacting ultralight dark matter Korshynska, K. Gorbar, E. V. Bidasyuk, Y. M. Yakimenko, A. I. Revaz, Y. Astrophysics of Galaxies Dark-matter-dominated dwarf galaxies provide an excellent laboratory for testing dark matter models at small scale and, in particular, the ultralight dark matter (ULDM) class of models. Within the framework of self-interacting bosonic dark matter, we use the observed velocity-dispersion profiles of seven dwarf spheroidal galaxies to constrain the parameters of ULDM. In our modeling, we account for the impact of the baryonic component on the velocity dispersion and ULDM halo structure. We find that the repulsive self-interaction of ULDM, which fits the observations, is almost negligible, consistent with non-interacting ULDM with a boson mass of approximately $1.6 \times 10^{-22}\,\mathrm{eV}$. In contrast, for attractively interacting ULDM, the best fit corresponds to a smaller boson mass of about $1.3 \times 10^{-22}\,\mathrm{eV}$, with self-interaction playing a significant role in shaping the dark-matter halo and thereby influencing the interpretation of observations. |
| title | Velocity dispersion profiles of dwarf spheroidal galaxies with self-interacting ultralight dark matter |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2510.15815 |